答:
請(qǐng)注明x是趨于0還是無(wú)窮?另外,括號(hào)表達(dá)清楚
x????????limx->0[(2x^2 +x)/(x-1)-ax-b]=6,??a,b???
??(x???) lim [(2x^2+x)/(x-1)-ax-b]=6(x???) lim [(2x^2+x)/(x-1)-(ax+b)(x-1)/(x-1)]=6(x???) lim [(2x^2+x-ax^2+ax-bx+b)/x]=6(x???) lim [(2-a)x+1+a-b]=6?????2-a=01+a-b=6????a=2??b=-3?????????????????????????????????????????????????????????ü??????